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capable of providing a thoroughly “squashed” signal, it was designed to excel in areas 
where transparent and musical dynamics control is desired.  The beauty of the optical 
design is its ability to apply heavy amounts of compression without pumping and 
breathing like VCA-based compressors.  The variable-mu compressor is capable of 
smoothly compressing fast-rising signal sources without undue side-effects.  In many 
cases you will hear the results of the compression without hearing the compressor. 
The tube-based equalizer was designed to help “fix” the instruments that give us the 
most headaches when we’re recording: kick, snare, bass, toms, guitar amps, voice, etc.  
The two sweepable parametric bands and selectable shelving bands have been optimized 
for musical instruments.  The two sweepable bands overlap each other as well as the 
high and low shelving bands, providing you with the ultimate in flexibility.  This EQ 
design gives you all the control you need to effectively dial in great sounds from even 
the poorest of sources.   

Setting Up 

Unpacking 

Your Pro Channel was packed with care at the factory.  The shipping carton was 
designed to protect the unit during initial shipment.  Please retain this carton for use in 
transporting the Pro Channel, or in the unlikely event that you need to return your Pro 
Channel for servicing. 

AC Power Hookup 

The Pro Channel has an internal power supply designed to operate at 100 to 125VAC, 
50 to 60Hz.  Units manufactured for use outside of the United States have been 
modified to comply with the required electrical specifications.  Under no circumstances 
should the power cable be altered.  If the cable becomes cut or damaged, discontinue 
use and have it replaced before operating the Pro Channel. 

Audio Connections 

Audio connections to and from the Pro Channel are balanced XLR (Pin 2 = Hot (+), Pin 
3 = Cold (-), Pin 1 = Ground) and unbalanced ¼” (Tip = Hot (+), Sleeve = Ground). 
The insert points between the preamp and compressor and the compressor and equalizer 
are ¼” (Tip = Hot (+), Sleeve = Ground) unbalanced connectors. 
We recommend using only high-quality cables and connectors. 

Installation 

The Pro Channel may be employed in a number of setups including: 

• 

Between a microphone and a mixer, digital multi-track recorder, DAT machine, hard 

disk recorder, or analog recorder. 

• 

In a mixer’s channel insert points. 

• 

Between a microphone and signal processors. 

• 

Between electronic musical instruments (synthesizers, guitars, basses, samplers, 

acoustic instruments with pickups) and other gear.   

- 6 - 

Содержание Pro Channel

Страница 1: ...HNOLOGY Inc 215 TREMONT STREET ROCHESTER NEW YORK 14608 USA 716 436 2720 Voice 716 436 3942 Fax Internet http www artroch com E mail art art com Pro Channel Professional Tube Mic Preamp Compressor Equ...

Страница 2: ...Pro Channel PROFESSIONAL TUBE MIC PREAMP COMPRESSOR EQUALIZER USER S GUIDE...

Страница 3: ...S INDICATORS 7 PREAMP CIRCUIT 7 Gain Control 7 Gain Switch 8 Phantom Power Switch 8 Phase Switch 8 Tube Drive Gain Reduction Display 9 Preamp Output 9 COMPRESSOR CIRCUIT 10 Threshold Control 10 Ratio...

Страница 4: ...VU Meter 15 VU Meter Switches 15 Power 15 REAR PANEL CONNECTIONS 15 INPUT AND OUTPUT CONNECTIONS 15 Input 16 Output 16 LOOP INSERTS 16 Preamp Compressor Loop 16 Compressor EQ Loop 16 Loop Connections...

Страница 5: ...s A solid state input circuitry Both electro optical and variable mu compressor designs Tube based semi parametric four band equalization with selectable frequency ranges and Q Three hand selected tub...

Страница 6: ...ign Notes The Pro Channel is a multi purpose tool for audio engineering and recording Enclosed in a two rack space 2U chassis are three independent circuits featuring a tube based analog preamplifier...

Страница 7: ...rotect the unit during initial shipment Please retain this carton for use in transporting the Pro Channel or in the unlikely event that you need to return your Pro Channel for servicing AC Power Hooku...

Страница 8: ...o produce a thump on power up and power down Note Like all tube based equipment the Pro Channel needs to warm up before being used Allow one to two minutes for the tubes to reach proper operating temp...

Страница 9: ...leaking from a tire when phantom power is disconnected but some can make some very nasty low rumbles and whines as well Another Note MOST dynamic microphones should not be affected or damaged if they...

Страница 10: ...g for a range before it turns into a distortion box After some use you ll find that the sweet spot of the Pro Channel is when this light flashes fairly regularly and the top red LED flashes occasional...

Страница 11: ...ery mild and musical compression ratio which is ideal for smoothing all types of signals At its maximum position the compression ratio is greater than 10 1 This is typically called hard limiting as it...

Страница 12: ...is to remind you that the compressor is out of the signal path but still gives you an indication how much compression will result when the compressor is engaged Use the Bypass switch when setting the...

Страница 13: ...s as range of 12dB Two ranges are selected with the Low Shift Switch 40Hz or 120Hz 40Hz is great for enhancing sub low frequencies such as those in bass guitars and kick drums Cutting 40Hz can also he...

Страница 14: ...h The Hi Mid Shift x 10 switch determines the range over which the Hi Mid Frequency control will cover In its out position the range is set at 200Hz to 2KHz In its in position the range is set at 2KHz...

Страница 15: ...qualizer circuit to enable you to remove it from the signal chain When set to its in Bypass position signal is allowed to pass from the compressor circuitry to the output tube section with no equaliza...

Страница 16: ...hand switch is set to Output the left hand switch has no effect Another Note The internal level monitoring points correspond to the level at the Send jacks of the two insert loops If you are using eit...

Страница 17: ...ack is inserted The loops may also be utilized to re patch the compressor and equalizer circuits in a different order i e signal flow preamp to equalizer to compressor Preamp Compressor Loop A loop is...

Страница 18: ...microphone instrument or line level source To use the Pro Channel as a mic or line preamplifier only simply press the Bypass switches to bypass the compression and equalizer circuitry Plug a microphon...

Страница 19: ...rument can be fixed by simply isolating the bad frequency and pulling it out After you determine approximately where the problem area is in the instrument highs lows mids isolate the track and boost o...

Страница 20: ...ever be sure to have output and monitoring levels turned DOWN before testing the sound Remember you have a great amount of gain available in the Pro Channel Grounding Connecting several pieces of equi...

Страница 21: ...Block Diagram 20...

Страница 22: ...s 3sec program dependent Maximum Compression 30dB optical 23dB vari mu EQ Frequency Bands Low Shelf 40Hz 120Hz selectable Low Mid Sweepable 20Hz to 200Hz 200Hz to 2KHz Shift out in Low Mid Q Wide Narr...

Страница 23: ...paid delivery to the factory service department or an authorized service center accompanied by proof of purchase date in the form of a valid sales receipt EXCLUSIONS This warranty does not apply in th...

Страница 24: ...ization RA number 4 Pack the unit in its original carton or reasonable substitute The packing box is not recommended for a shipping carton Put the packaged unit in another box for shipping Print the R...

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